/* style.css */

body {
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
background-color: #f0f0f0;
margin: 0;
font-family: Arial, sans-serif;
}

#calculator {
width: 320px;
background-color: #ffffff;
border-radius: 10px;
box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
padding: 20px;
}

#display {
height: 60px;
background-color: #222;
color: #fff;
display: flex;
align-items: center;
justify-content: flex-end;
padding: 0 15px;
border-radius: 8px;
margin-bottom: 15px;
}

#d {
font-size: 2rem;
margin: 0;
}

.row {
display: flex;
gap: 10px;
margin-bottom: 10px;
}

button {
flex: 1;
height: 50px;
font-size: 1.2rem;
border: none;
border-radius: 8px;
cursor: pointer;
transition: background-color 0.2s, transform 0.1s;
}

button.num {
background-color: #e0e0e0;
}

button.op {
background-color: #f39c12;
color: #fff;
}

button.ctrl {
background-color: #bdc3c7;
}

#zero {
flex: 2;
}

button:active {
transform: scale(0.98);
opacity: 0.8;
}